Shunsatsuren, I am not saying this to be rude, but please read carefully through “hanging 101.” I see several things in your approach that need to be clarified or are probably unsafe.
Going for a set longer than 20 minutes with a compression hanger can be dangerous as they tend to cut off circulation to some extent no matter how well they are attached.
Swinging is effective but an advanced hanging exercise. Get your discomfort/fatigue from the weight you are using first and just try some straight hanging to get a feel for things. If you need to swing to feel it, it is too light.
2.5 pounds may be heavy enough for you to gain, but it won’t be for long. You will always need to increase weights as your tissues toughen through hanging. I go by discomfort in the target tissues, when I stop feeling enough of it, I add 1/2 pound at a time until I do.
30 minutes a day of actual hanging sets, including all the breaks, warm ups, jelqs, warm downs, etc. is still only 30 minutes of hanging time, even if it is 1 hour of total time. The 10 hour per week recommendation is based on hang time, not total time. I usually take about 3 hours total to do 5 to 6 hanging sets which is only 1 hour and 40 minutes to 2 hours of hang time, about a third of my total time. I usually end up with 13-14 hours of hang time each week.
If I were you, and I’m not saying you won’t gain if you don’t do this, I would shoot for at least 3 20 minute hanging sets a day. Unless you wanna go hardcore, but, like I said, I wouldn’t personally recommend that.